Summary
Meiosis in F1-hybridHelianthus tuberosus (n=51) xH. annuus (n=17) was studied. At least five inversions were determined with certainty. The genom formula ofH. tuberosus should be At1At2Bt/At1At2Bt and that ofH. annuus-Ba/Ba. Genom formula of F1-hybrid is At1Bt/At2Ba, the chromosomes of Ba-genom conjugating with those of Bt-genom, while the other chromosomes of the other two genoms (At1 and At2) conjugating autosyndetically.
Cytogenetic indices for producing plants combining characters ofH. tuberosus andH. annuus are discussed.
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Kostoff, D. Autosyndesis and structural hybridity in F1-hybrid Helianthus tuberosus L. x Helianthus annuus L. and their sequences. Genetica 21, 285–300 (1939). https://doi.org/10.1007/BF01508121
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DOI: https://doi.org/10.1007/BF01508121